Abstract

This study experimentally and numerically examines the correlated color temperature (CCT)
stability issue for hybrid warm white high-voltage light-emitting diodes (HV-LEDs) by using a
current compensation method. This method could efficiently maintain the CCT stability factor at
approximately 1.0 and yield greater color uniformity with Δu'v' values ranging from 0.017 to 0.003 in CIE 1976 chromaticity
coordinates. The simulation results show that the red chip intensity drop is the primary cause
of CCT instability in the hybrid warm white system when the temperature increases. Therefore,
Furthermore, results indicate that the relative lumen drop improves from 21% to 15% by using a
current compensation method.

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